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  <div id="layout-content"><div id="splfileobject.fwrite" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">SplFileObject::fwrite</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.1.0, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">SplFileObject::fwrite</span> &mdash; <span class="dc-title">Write to file</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-splfileobject.fwrite-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>SplFileObject::fwrite</strong></span>(<span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code><span class="initializer"> = 0</span></span>): <span class="type"><span class="type">int</span>|<span class="type"><span class="type false">false</span></span></span></div>

  <p class="para rdfs-comment">
   Writes the contents of <code class="parameter">string</code> to the file
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-splfileobject.fwrite-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">data</code></dt>

     <dd>

      <p class="para">
       The string to be written to the file.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">length</code></dt>

     <dd>

      <p class="para">
       If the <code class="parameter">length</code> argument is given, writing will
       stop after <code class="parameter">length</code> bytes have been written or
       the end of <code class="parameter">string</code> is reached, whichever comes
       first.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-splfileobject.fwrite-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the number of bytes written, or <strong><code>false</code></strong> on error.
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-splfileobject.fwrite-changelog">
  <h3 class="title">更新日志</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>版本</th>
      <th>说明</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
      <td>7.4.0</td>
      <td>
       The function now returns <strong><code>false</code></strong> instead of zero on failure.
      </td>
     </tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-splfileobject.fwrite-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3716">
    <p><strong>示例 #1 <span class="methodname"><strong>SplFileObject::fwrite()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$file&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SplFileObject</span><span style="color: #007700">(</span><span style="color: #DD0000">"fwrite.txt"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"w"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$written&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #DD0000">"12345"</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #DD0000">"Wrote&nbsp;</span><span style="color: #0000BB">$written</span><span style="color: #DD0000">&nbsp;bytes&nbsp;to&nbsp;file"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Wrote 5 bytes to file
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-splfileobject.fwrite-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.fwrite.html" class="function" rel="rdfs-seeAlso">fwrite()</a> - 写入文件（可安全用于二进制文件）</span></li>
   </ul>
  </p>
 </div>


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